The big question about Unreal 4 Scale

Ah so that’s what the confusion is about.

Well it’s simple, UE4’s scale is basically twice as UDK’s.
The default character height in UDK is 96UU, in UE4 it is 192UU (which is 96 times two) so basically assuming you will use the default pawn heights for reference you can just scale everything you had in UDK by 2.